Simulation Based Analysis of Digitally Controlled 4-phase DC-DC Converter with Coupled Inductors

Interleaved converters are used in many different conversion systems involving various topologies and are related to different fields of application due its advantages over single-phase converters. Such advantages include reduced current in switching devices and passive elements, reduced output current ripple, and so on. Reductions in size and costs of magnetic components and inductors current ripple can be achieved by an integration of magnetics. In this paper application of 2-phase coupled inductor designed in convenient way by using commercially manufactured coil formers and ferrite cores is analyzed to developed 4-phase  interleaved DC-DC converter. Different structures of the coupled inductor for 4 phases is studied. The steady state phase and output current ripple in buck mode of the interleaving magnetic integrated bidirectional DC-DC converter is simulated. The necessary count of inductors for selected topology are  manufactured and placed on the PCB board

Design and implementation a novel single switch high gain DC-DC converter based on coupled inductor with low-ripple input current

A novel high-gain and high-efficiency direct current to direct current (DC-DC) converter is introduced in this paper. The presented converter is suitable for low-voltage renewable energy resources such as photovoltaic (PV) and fuel cell (FC). The existence of series inductance with the input source ensures continuous and low-ramp input current, which is important for extracting maximum power from resources. Using coupled inductor technology and an intermediate capacitor in the suggested converter leads to a high gain voltage. In the presented topology for recovering energy from the leakage inductor, reducing voltage stress on the power switch, and so decreasing overall converter losses, a passive clamp circuit is used. The suitable operation range of duty cycle in the converter, besides the leakage inductor, decreases the problem of reverse recovery in diodes. The low value of the leakage inductor and the low volume and cost of the proposed converter are due to the low turn ratio of the coupled inductor. Details of the operation principles of the proposed converter have been discussed in this paper. The presented simulation and laboratory prototype results verify the theoretical analysis and performance of the suggested topology

Conversión de Potencia para un Sistema de Almacenamiento Híbrido Batería-Capacitor

Context: Thanks to the low emissions of CO2 generated by electric systems, those solutions have anincreased attention from industry and academia. However, the electrical storage systems required in alarge amount of applications must to have both high energy and power densities. Method: To meet those requirements, this paper proposes an active hybrid energy storage system(HESS), which is formed by a battery, i.e. the device with high energy density, and a capacitor, i.e. the device with high power capability. The proposed power system also protects the battery by limiting the current derivative. Results: Two sliding-mode controllers (SMC) are designed to regulate both the battery current and the load voltage. The design process guarantees the global stability and safe battery operation. Conclusions: The controller avoids the battery degradation caused by the high-frequency current components since the capacitor assumes those components demanded by the load profile.Contexto: Gracias a las bajas emisiones de CO2 de los sistemas el´ectricos, estos han ganado mucha atenci´on por parte de la industria y la academia. Sin embargo, los sistemas de almacenamiento de energ´ıa requeridos en un sin numero de aplicaciones deben garantizar ser de alta densidad de energ´ıa y potencia. M´etodo: Para satisfacer estos requerimientos, este trabajo propone un sistema de almacenamiento de energ´ıa h´ıbrido (HESS) activo, el cual es formado por una bater´ıa como dispositivo de alta densidad de energ´ıa, y un capacitor como el dispositivo de alta densidad de potencia. Asimismo, la soluci´on propuesta protege la bater´ı a trav´es de la limitaci´on de la derivada de la corriente. Resultados: Se dise˜nan dos controladores por modos deslizantes, uno para la corriente de la bater´ıa y otro para regular el voltaje en la carga. El proceso de dise˜no garantiza la estabilidad global del sistema y una operaci´on segura de la bater´ıa

A Study on the New DC-DC Bidirectional Converter

Since electronically controlled engines & electric propulsion ships were introduced, the importance of UPS(Uninterruptible Power Supply) on emergency power supply devices which use battery has been emphasized recently. The bidirectional converter is a crucial component on emergency power supply device. In this paper, a new DC-DC bidirectional converter is presented. The conversion ratio of the proposed converter is one fourth of the conventional buck converter in step-down mode and four times higher than conventional boost converter in step up mode. The voltage stress of switches in the proposed converter is one quarter of high side voltage before and after turning on /off switches. Moreover, due to charge balance of its blocking capacitors, the proposed converter can distribute equal currents between two interleaved modules without using any extra current-sharing control method. The features, operating principles, and theoretical analysis of the proposed bidirectional converter are presented. By using PSIM software, the theoretical analysis validation of a 50/400V, 480W converter has been verified.목차 목 차 ⅰ 그림 목차 ⅲ 표 목차 ⅳ Abstract ⅴ 기호 및 약어 ⅶ 1. 서론 1 1.1 연구배경 및 동향 1 1.2 연구 목적 2 1.3 논문의 구성 3 2. DC-DC 컨버터의 종류 및 기능 4 2.1 Buck 컨버터 4 2.2 Boost 컨버터 11 2.3 Buck - Boost 컨버터 15 3. DC-DC 양방향 컨버터 21 3.1 기존의 Buck/boost DC-DC 양방향 컨버터 21 3.2 제안 된 양방향 DC-DC 양방향 컨버터 24 3.2.1 제안된 양방향 컨버터의 작동원리 24 3.2.2 제안된 양방향 컨버터의 특성 37 3.2.3 인덕터 설계 40 4. 시뮬레이션 42 4.1 기존의 Buck/Boost DC-DC 양방향 컨버터 시뮬레이션 42 4.2 제안된 DC-DC 양방향 컨버터 시뮬레이션 46 5. 결론 51 참고 문헌 52Maste

A common ground switched-quasi-Z-source bidirectional DC-DC converter with wide-voltage-gain range for EVs with hybrid energy sources

A common ground switched-quasi-Z-source bidirectional DC-DC converter is proposed for electric vehicles (EVs) with hybrid energy sources. The proposed converter is based on the traditional two-level quasi-Z-source bidirectional DC-DC converter, changing the position of the main power switch. It has the advantages of a wide voltage gain range, a lower voltage stress across the power switches, and an absolute common ground. The operating principle, the voltage and current stresses on the power switches, the comparisons with the other converters, the small signal analysis and the controller design are presented in this paper. Finally, a 300W prototype with Uhigh=240V and Ulow=40~120V is developed, and the experimental results validate the performance and the feasibility of the proposed converter

Interleaved switched-capacitor bidirectional DC-DC converter with wide voltage-gain range for energy storage systems

In this paper, an interleaved switched-capacitor bidirectional DC-DC converter with a high step-up/step-down voltage gain is proposed. The interleaved structure is adopted in the low-voltage side of this converter to reduce the ripple of the current through the low-voltage side, and the series-connected structure is adopted in the high-voltage side to achieve the high step-up/step-down voltage gain. In addition, the bidirectional synchronous rectification operations are carried out without requiring any extra hardware, and the efficiency of the converter is improved. Furthermore, the operating principles, voltage and current stresses, and current ripple characteristics of the converter are analyzed. Finally, a 1kW prototype has been developed which verifies a wide voltage-gain range of this converter between the variable low-voltage side (50V-120V) and the constant high-voltage side (400V). The maximum efficiency of the converter is 95.21% in the step-up mode and 95.30% in the step-down mode. The experimental results also validate the feasibility and the effectiveness of the proposed topology

A switched-capacitor bidirectional DC-DC converter with wide voltage gain range for electric vehicles with hybrid energy sources

A switched-capacitor bidirectional DC-DC converter with a high step-up/step-down voltage gain is proposed for electric vehicles (EVs) with a hybrid energy source system (HESS). The converter presented has the advantages of being a simple circuit, a reduced number of components, a wide voltage-gain range, a low voltage stress, and a common ground. In addition, the synchronous rectifiers allow zero voltage switching (ZVS) turn-on and turn-off without requiring any extra hardware, and the efficiency of the converter is improved. A 300W prototype has been developed which validates the wide voltage-gain range of this converter using a variable low-voltage side (40V-100V) and to give a constant high-voltage side (300V). The maximum efficiency of the converter is 94.45% in step-down mode and 94.39% in step-up mode. The experimental results also validate the feasibility and the effectiveness of the proposed topology

Soluções Avançadas do Controlo do Processo de Carga de EV's

O documento que está a ser realizado com base no trabalho (que se baseia essencialmente numa análise teórica da implementação das normas IEC 61851 e ISO 15118) dá uma breve explicação do conceito de bidirecionalidade e como esta é incorporada no sistema de carregamento (sistema desenhado com base na norma IEC 61851) e quais os conversores AC/DC e DC/DC usados para possibilitarem este acontecimento. Entre os diversos tópicos abordados no presente documento encontra-se também uma análise da norma ISO 15118 e dos seus Uses Cases, uma explicação de como é feita a comunicação entre o EV e o posto de carregamento para ser possível a bidirecionalidade e a implementação do conceito de V2G, por ?m são tiradas algumas conclusões relativas ao trabalho realizado até ao momento bem como a perspetivas de trabalho futuro